The 5 Yard Cone Side Shuffle exercise is one of the best basketball workouts for teaching lateral quickness. The below HD video along with text instructions showcases this basketball shuffling workout along with 2 different variations that are slightly more advanced: the "Outside Foot Up" variation and the "Inside Foot Up" variation.
Make sure that you study the correct footwork before adding this drill to your basketball training plan because you want to make sure that you are going to be practicing it the right way and not developing any bad habits. One of the big keys to becoming quicker or faster is learning to be more efficient with your movements. However, after you have learned the correct footwork the player needs to push themselves and go as quickly as they can (with good form).